/*
 * Copyright (c) 2019 The StreamX Project
 * <p>
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.streamxhub.streamx.flink.udf

import org.apache.flink.table.functions.ScalarFunction

import java.text.SimpleDateFormat
import java.util.Date

class HashCode(val factor: Int = 12) extends ScalarFunction {
  def eval(s: String): Int = s match {
    case null => 0
    case x => x.hashCode() * factor
  }
}

class DateFormat(val format: String = "yyyy-MM-dd HH:mm:ss") extends ScalarFunction {
  var sf: SimpleDateFormat = _

  def eval(time: Long): String = {
    if (sf == null) {
      sf = new SimpleDateFormat(format)
    }
    sf.format(new Date(time))
  }
}

class Length extends ScalarFunction {
  def eval(str: String): Int = {
    str match {
      case null => 0
      case x => x.length
    }
  }
}
